Transducer is a generic name given to a device, usually electronic, that converts a physical attribute to a measurement signal.
Torque transducers measure the torque (or twisting motion) on a static or rotating system. The static torque element has little movement and is therefore more economic to manufacture and purchase.
Rotary and/or dynamic torque are more complicated as the signal needs to be transferred using slip rings, wireless telemetry or rotary transformers/inductance technology so the strain gauged shaft can continuously rotate.
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